Here are some facts that you should know about space vegetables.

　　Space vegetables are grown from seeds that are carefully selected. When seeds are brought back from space, they are tested to make sure that the vegetables they grow will be safe to eat. There are no traces(痕迹) of radiation after testing.

　　Space vegetables are better for you than normal vegetables. For example, space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes. Another popular space vegetable is peppers. Space peppers contain 20 percent more vitamin C than normal peppers.

　　After genetically modified foods(转基因食品) came onto the market, people worried that they were eating unknown things. For example, if nut genes are put inside potatoes, people allergic(过敏) to nuts might get very sick from eating these potatoes because they do not know they are also eating nuts. Unlike genetically modified foods, space vegetables have not been genetically changed. This means that no new genes are put into the vegetables. Therefore, there are no dangers of eating something unknown.

　　Space vegetables are safe,

　　1

　　, and good for you to eat.

　　Measures taken to ensure (确保)

　　the

　　2

　　of

　　space vegetables Before being brought to the outer space, the

　　3

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